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Adsorption and Absorption

36.Number of ...

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36.Number of moles of AgCl precipitated when excess of silver nitrate solution is added to A,B and C respectively A=CoCl3 .6NH3 (yellow) B=CoCl3 .5NH3 ( purple ) C=CoCl3.4NH3 ( violet )

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A g N O_{3}

solution is added in excess to

1 M

C o {C l}_{3} . x N H_{3}

A g C l

is formed? What is the value of

x

?

Q. A sufficient amount of

A g N O_{3}

solution was added to a solution containing

23.35 g

of the complex salt

C o C l_{3} \cdot 4 N H_{3}

The mass of the precipitated

A g C l

14.35 g

. Determine the no. of Chlorine atoms outside the coordination sphere of the complex

(C o = 59 g

m o l^{- 1})

:

Q. A few drops of silver nitrate solution are added to a solution of a salt. If a pale yellow precipitate forms, which ion from the salt is most likely to be in the solution?

Q. A metal nitrate (X) gives a white precipitate with ammonia solution, but the precipitate get dissolved on adding ammonium salt. Lead dioxide and concentrated nitric acid on boiling with a dilute solution of metal nitrate (X) produces a violet-red (or purple) colour solution. Small amount of metal nitrate (X) gives an amethyst-red bead with borax in oxidising flame when cold. The cation of metal nitrate is :

Q. Only two-third of the chlorine contained in the solution of the complex salt

C o C l_{3} \cdot 5 N H_{3}

were precipitated from it by silver nitrate. No cobalt or free ammonia were detected in the solution of the salt.

The electrical conductivity of the solution shows that the salt dissociates into three ions. What is the coordination structure of the complex salt?

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